SU905775A1

SU905775A1 - Method of material analysis

Info

Publication number: SU905775A1
Application number: SU802894423A
Authority: SU
Inventors: Валерий Федорович Змитрук; Виктор Леонидович Сорокин; Борис Алексеевич Клыпин; Светлана Михайловна Новокщенова; Людмила Георгиевна Аполовникова; Галина Георгиевна Гулей; Инна Викторовна Юнакова
Priority date: 1980-03-07
Filing date: 1980-03-07
Publication date: 1982-02-15

Description

Изобретение относится к контролю и испытаниям материалов и может быть использовано в металлургии, машиностроении и других отраслях промышленности для анализа материала на наличие инородных включений и их ⁵ вида.The invention relates to the control and testing of materials and can be used in metallurgy, mechanical engineering and other industries to analyze the material for the presence of foreign inclusions and their ⁵ types.

Известен способ анализа материала, основанный на Проведении металлографических исследований [1 ].A known method of analysis of the material, based on the conduct of metallographic studies [1].

Однако этот способ характеризуется большой' трудоемкостью, продолжительностью и существенным влиянием субъективных факторов на полученные результаты, что является его основным ₁₅недостатком.However, this method is characterized by great complexity, duration and significant influence of subjective factors on the results, which is its main ₁₅ drawback.

Наиболее близким по технической сущности к изобретению является способ анализа материала/ заключающийся в том, что определяют коэффициент концентра- _мции напряжений около инородных включений методом исследования фотоупругости и по нему судят о виде инородных включений [2].The closest in technical essence to the invention is a method for analyzing material / the method comprising determining a concentration factor of about _m tion voltages foreign inclusions photoelasticity research method and it is judged on a foreign impurities [2].

Недостатком данного способа являются трудоемкость и, следовательно малая производительность, малая достоверность контроля, обусловленная субъективностью проведения измерения.The disadvantage of this method is the complexity and, therefore, low productivity, low reliability of control, due to the subjectivity of the measurement.

Цель изобретения - повышение про- ’ изводительности и достоверности контроля.The purpose of the invention is to increase the productivity and reliability of control.

Эта цель в изобретении достигается за счет того, что нагружают контролируемое изделие и измеряют деформацию изделия в момент появления сигналов акустической эмиссии и в момент, когда интенсивность этих сигналов максимальна, а коэффициент концентрации напряжений около инородных включений определяют как отношение этих деформаций.This goal in the invention is achieved due to the fact that the controlled product is loaded and the product deformation is measured at the moment of acoustic emission signals appearance and at the moment when the intensity of these signals is maximum, and the stress concentration coefficient near foreign inclusions is determined as the ratio of these deformations.

На чертеже приведена схема реализации способа.The drawing shows a diagram of the implementation of the method.

На схеме обозначено исследуемый объект 1, нагружающее устройство 2, последовательно соединенные приемник 3, блок 4 фильтрации и усиления,The diagram shows the studied object 1, the loading device 2, the receiver 3 connected in series, the filtering and amplification unit 4,

905775 4 пороговое устройство 5, первый логический блок 6 и ключевое устройство 7, к второму входу которого подключен выход блока 8 измерения деформации, а выходы ключевого устройства 7 5 подключены к блоку 9 определения коэффициента концентрации напряжений и второму логическому блоку 10, выход которого связан с вторым входом блока 9 определения коэффициента концентра-Ю ции напряжений, а между выходом первого логического блока 6 и блоком 9 определения концентрации напряжений включено устройство 11 регистрации.905775 4 threshold device 5, the first logical unit 6 and the key device 7, to the second input of which the output of the strain measurement unit 8 is connected, and the outputs of the key device 7 5 are connected to the voltage concentration coefficient determination unit 9 and the second logical unit 10, the output of which is connected to the second input of the voltage concentration coefficient determination unit 9, and the recording device 11 is turned on between the output of the first logic unit 6 and the voltage concentration determination unit 9.

Способ заключается в следующем. 15 Исследуемый объект 1 деформируют с помощью нагружающего устройства 2. Акустические сигналы, возникающие при достижении материалом пластической деформации в области условно 20 изображенного неметаллического включения 12, преобразуются приемником 3 в электрические, усиливаются и фильтруются в блоке 4 фильтрации и усиления и подаются на пороговое устрой- 25 ство 5. При превышении сигналом порогового уровня· на выходе порогового устройства 5 появляются сигналы, поступающие в первый логический блок 6, на выходе которого в разное зо время появляются два сигнала: первый соответствует моменту, когда появляются первые акустические сигналы, а второй - моменту появления максимума интенсивности акустических сигналов. ₃₅Эти сигналы в указанные моменты открывают ключевое устройство 7, а сигналы, несущие информацию о двух значениях деформации из блока 8 измерения деформации, поступают в блок 9 опре деления коэффициента концентрации напряжений, который управляется вторым логическим блоком 10. Полученное значение коэффициента концентрации отображается в устройстве 11 регистрации .The method is as follows. 15 The object under study 1 is deformed using a loading device 2. Acoustic signals that occur when the material reaches plastic deformation in the region of conditionally 20 non-metallic inclusion 12 are converted by the receiver 3 into electrical ones, amplified and filtered in the filtering and amplification unit 4, and fed to the threshold device 25 step 5. When the signal exceeds the threshold level There are two signals: the first corresponds to the moment when the first acoustic signals appear, and the second to the moment of the appearance of the maximum intensity of acoustic signals. ₃₅ These signals at the indicated moments open the key device 7, and the signals carrying information about the two strain values from the strain measurement unit 8 are received in the stress concentration factor determination unit 9, which is controlled by the second logical unit 10. The obtained concentration coefficient value is displayed in the device 11 registration.

Данный способ позволяет повысить производительность и достоверность * определения вида инородных включений в материале путем использования акустической эмиссии.This method allows to increase the productivity and reliability * of determining the type of foreign inclusions in the material by using acoustic emission.

Claims

The invention relates to the control and testing of materials and can be used in metallurgy, mechanical engineering and other industries to analyze material for the presence of foreign inclusions and their type. There is a method for analyzing material based on metallographic research 1. However, this method is characterized by great laboriousness, duration, and significant influence of subjective factors on the results obtained, which is its main disadvantage. The closest to the technical essence of the invention is the method of analyzing the material, -conclusions, in that they determine the stress concentration coefficient near foreign inclusions by the method of studying photoelasticity and judge about the type of foreign inclusions 2. The disadvantage of this method is laboriousness and, consequently, low productivity, low reliability of control, due to the subjectivity of the measurement. The purpose of the invention is to increase the productivity and reliability of the control. This goal in the invention is achieved by loading the monitored product and measuring the deformation of the product at the time of the appearance of acoustic emission signals and at the time when the intensity of these signals is maximum and the stress concentration factor around the foreign inclusions is defined as the ratio of these deformations. The drawing shows a diagram of the implementation of the method. The diagram shows the object under study 1, the loading device 2, the receiver 3 connected in series, the filtering and amplifying unit A, 3905 threshold device 5, the first logic unit 6 and the key device 7, to the second input of which the output of the deformation measuring unit 8 is connected, and the outputs of the key device 7 are connected to the voltage concentration determination unit 9 and the second logic unit 10, the output of which is connected to the second input of the voltage concentration ratio determination unit 9, and between the output of the first logic unit The unit 6 and the unit 9 for determining the concentration of stresses are turned on the recorder 11. The method is as follows. The object under study 1 is deformed with the help of a loading device 2. Acoustic signals arising when the material reaches plastic deformation in the region of the conventionally depicted non-metallic inclusion 12 are converted by the receiver 3 into electrical ones, amplified and filtered in block 4 of filtering and amplification and fed to threshold device 5. When exceeded the signal of the threshold level at the output of the threshold device 5 is the signals arriving at the first logic block 6, at the output of which at different times there are two signal: the first corresponds to the moment when the first acoustic signals appear, and the second to the moment of appearance of the maximum intensity of the acoustic signals. These signals open the key device 7 at specified times and the signals that carry information about two deformation values from the deformation measurement unit 8 , enters unit 9 for determining the stress concentration factor, which is controlled by the second logic unit 10. The resulting concentration coefficient value is displayed in the recorder 11. This method allows to increase the productivity and reliability of determining the type of foreign inclusions in the material by using acoustic emission. Claims The method of analyzing a material, which consists in determining the stress concentration factor around foreign inclusions and judging the type of foreign inclusions, which is the case, in order to improve the performance and reliability of the control, load the product under test and measure the deformation of the product at the time of the appearance of acoustic emission signals and in the moment when the intensity of these signals is maximum, and the stress concentration factor near the foreign inclusions is determined as these deformations. Sources of information taken into account in the examination 1.Stal. Metallographic methods for the determination of non-metallic inclusions, GOST 1713-70 1970.

2.Finkel V.N. Physical basis of inhibition of destruction. M., Metallurgists 1977, p. (prototype).

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